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Loans Receivable - Loan Delinquencies by Loan Portfolio and Class (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | $ 13,051,199 | $ 12,959,272
Days delinquent, current | 12,983,037 | 12,928,463
Days delinquent, past due | $ 68,162 | $ 30,809
% based on $, current | 99.48% | 99.76%
% based on $, past due | 0.52% | 0.24%
30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 12,133 | $ 4,470
% based on $, past due | 0.09% | 0.03%
60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 10,141 | $ 3,973
% based on $, past due | 0.08% | 0.03%
90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 45,888 | $ 22,366
% based on $, past due | 0.35% | 0.17%
Commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | $ 7,341,847 | $ 7,044,426
Days delinquent, current | 7,307,774 | 7,041,423
Days delinquent, past due | $ 34,073 | $ 3,003
% based on $, past due | 0.46% | 0.04%
Commercial loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 3,578 | $ 0
Commercial loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 3,958 | 778
Commercial loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 26,537 | 2,225
Commercial loans | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | 1,609,800 | 1,538,240
Days delinquent, current | 1,609,325 | 1,538,240
Days delinquent, past due | $ 475 | $ 0
% based on $, past due | 0.03% | 0.00%
Commercial loans | Multi-family | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 475 | $ 0
Commercial loans | Multi-family | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 0 | 0
Commercial loans | Multi-family | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 0 | 0
Commercial loans | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | 1,942,854 | 1,884,688
Days delinquent, current | 1,914,254 | 1,884,210
Days delinquent, past due | $ 28,600 | $ 478
% based on $, past due | 1.47% | 0.03%
Commercial loans | Commercial real estate | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 85 | $ 0
Commercial loans | Commercial real estate | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 3,958 | 195
Commercial loans | Commercial real estate | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 24,557 | 283
Commercial loans | Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | 2,243,465 | 2,115,513
Days delinquent, current | 2,242,422 | 2,114,650
Days delinquent, past due | $ 1,043 | $ 863
% based on $, past due | 0.05% | 0.04%
Commercial loans | Commercial and Industrial [Member] | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 216 | $ 0
Commercial loans | Commercial and Industrial [Member] | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 0 | 583
Commercial loans | Commercial and Industrial [Member] | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 827 | 280
Commercial loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | 1,393,107 | 1,352,414
Days delinquent, current | 1,389,404 | 1,350,752
Days delinquent, past due | $ 3,703 | $ 1,662
% based on $, past due | 0.27% | 0.12%
Commercial loans | Construction | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 2,550 | $ 0
Commercial loans | Construction | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 0 | 0
Commercial loans | Construction | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 1,153 | 1,662
Commercial loans | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | 152,621 | 153,571
Days delinquent, current | 152,369 | 153,571
Days delinquent, past due | $ 252 | $ 0
% based on $, past due | 0.17% | 0.00%
Commercial loans | Land - acquisition & development | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 252 | $ 0
Commercial loans | Land - acquisition & development | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 0 | 0
Commercial loans | Land - acquisition & development | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 0 | 0
Consumer loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | 5,709,352 | 5,914,846
Days delinquent, current | 5,675,263 | 5,887,040
Days delinquent, past due | $ 34,089 | $ 27,806
% based on $, past due | 0.60% | 0.47%
Consumer loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 8,555 | $ 4,470
Consumer loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 6,183 | 3,195
Consumer loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 19,351 | 20,141
Consumer loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | 299,351 | 295,953
Days delinquent, current | 299,351 | 295,953
Days delinquent, past due | $ 0 | $ 0
% based on $, past due | 0.00% | 0.00%
Consumer loans | Construction | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 0 | $ 0
Consumer loans | Construction | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 0 | 0
Consumer loans | Construction | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 0 | 0
Consumer loans | Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | 5,048,435 | 5,293,962
Days delinquent, current | 5,016,530 | 5,267,608
Days delinquent, past due | $ 31,905 | $ 26,354
% based on $, past due | 0.63% | 0.50%
Consumer loans | Single-family residential | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 7,477 | $ 3,922
Consumer loans | Single-family residential | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 5,872 | 3,108
Consumer loans | Single-family residential | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 18,556 | 19,324
Consumer loans | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | 109,845 | 101,394
Days delinquent, current | 109,248 | 101,029
Days delinquent, past due | $ 597 | $ 365
% based on $, past due | 0.54% | 0.36%
Consumer loans | Land - consumer lot loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 95 | $ 152
Consumer loans | Land - consumer lot loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 168 | 0
Consumer loans | Land - consumer lot loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 334 | 213
Consumer loans | HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | 140,272 | 140,222
Days delinquent, current | 138,933 | 139,491
Days delinquent, past due | $ 1,339 | $ 731
% based on $, past due | 0.95% | 0.52%
Consumer loans | HELOC | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 916 | $ 275
Consumer loans | HELOC | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 116 | 76
Consumer loans | HELOC | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 307 | 380
Consumer loans | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable (amortized cost) | 111,449 | 83,315
Days delinquent, current | 111,201 | 82,959
Days delinquent, past due | $ 248 | $ 356
% based on $, past due | 0.22% | 0.43%
Consumer loans | Consumer | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 67 | $ 121
Consumer loans | Consumer | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | 27 | 11
Consumer loans | Consumer | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Days delinquent, past due | $ 154 | $ 224

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